5
M
AINTENANCE
Important
• Only a qualified service person is allowed to perform
maintenance.
• Before obtaining access to terminal devices, all power supply
circuits must be interrupted.
• Do not use water or air of 50
°
C or higher for cleaning air filters
and outside panels.
• When cleaning the heat exchanger, be sure to remove the
switchbox, fan motor and drain pump. Water or detergent
may deteriorate the insulation of electronic components and
result in burn-out of these components.
H
OW
TO
CLEAN
THE
AIR
FILTER
Clean the air filter when the display shows “
”
(TIME TO CLEAN AIR FILTER).
Increase the frequency of cleaning if the unit is installed in a room
where the air is extremely contaminated.
(As a yardstick for yourself, consider cleaning the filter once a half
year.)
If the dirt becomes impossible to clean, change the air filter.
(Air filter for exchange is optional.)
For FHYC-units
(Refer to figure 11)
1. Open the suction grill.
Push both knobs simultaneously and carefully lower the grille.
(Identical procedure for closing.)
2. Remove the air filters
Pull the air filter clips toward you(2), and detach the filter (3).
3. Clean the air filter. (Refer to figure) 10.
air flow direction over
filter.)
Use vacuum cleaner (B) or wash the air filter with water (A).
When the air filter is very dirty, use soft brush and neutral
detergent.
4. Remove water and dry in the shade.
5. Fix the air filter.
Attach the air filter to the suction grill by hanging it to the projected
portion above the suction grill (4).
Press the bottom of the air filter against the projections on the
bottom of the grille to snap the air filter into its place (5).
6. Shut the air inlet grille (1).
Refer to item No. 1.
7. After turning on the power, press the FILTER SIGN RESET
button.
The “TIME TO CLEAN AIR FILTER” display vanishes.
For FHYB-units
(Refer to figure 12)
1. Open the suction grille. (Only for bottom suction.)
Slide both knobs simultaneously as shown and then pull them
downward (1).
If chains are present, unhook the chains (2).
2. Remove the air filters.
Remove the air filters by pulling its cloth upward (rear suction(3))
or backward (bottom suction(4)).
3. Clean the air filter. (Refer to figure 10.
air flow direction over
filter.)
Use vacuum cleaner (B) or wash the air filter with water (A).
When the air filter is very dirty, use soft brush and neutral
detergent.
Remove water and dry in the shade.
T
ROUBLE
SHOOTING
If one of the following malfunctions occurs, take the
measures shown below and contact your Daikin dealer.
The system must be repaired by a qualified service person.
• If a safety device such as a fuse, a breaker, or an earth leakage
breaker frequently actuates, or ON/OFF switch does not properly
work.
Measure: Turn off the main power switch.
• If water leaks from unit.
Measure: Stop the operation.
• If the display “
” (INSPECTION) (1), “UNIT No.” (2), and the
OPERATION lamp (3) flashes and the “MALFUNCTION CODE”
(4) appears. Refer to Fig. 7.
Measure: Notify your Daikin dealer and inform him/her
of the display.
If the system does not operate properly, except for the
above mentioned case, and none of the above mentioned
malfunctions is evident, investigate the system according
to the following procedures.
If the system does not operate at all.
• Check if there is a power failure.
Wait until power is restored. If power failure occurs during
operation, the system automatically restarts immediately after
the power supply recovers.
• Check if the fuse has blown or breaker has been tripped.
Change the fuse or set the breaker.
If the system stops operating after operation is complete.
• Check if the air inlet or outlet of outdoor or indoor unit is blocked
by obstacles.
Remove the obstacle and make it well-ventilated.
• Check if the air filter is clogged.
Have a qualified service person clean the air filters.
The system operates but it does not sufficiently
cool or heat.
• If the air inlet or outlet of the indoor or the outdoor unit is blocked
with obstacles.
Remove the obstacle and make it well-ventilated.
• If the air filter is clogged.
Ask a qualified service person to clean the air filter.
• If the set temperature is not proper. (Refer to “OPERATION
PROCEDURE, Automatic operation”)
• If the FAN SPEED CONTROL button is set to LOW SPEED.
(Refer to “OPERATION PROCEDURE, Automatic operation”)
• If the air flow angle is not proper. (Refer to “Operation procedure,
adjust the air flow direction”.)
• If the doors or the windows are open. Shut doors or windows to
prevent wind from coming in.
• If direct sunlight enters the room (when cooling).
Use curtains or blinds.
• When there are too many inhabitants in the room. Cooling effect
decreases if heat gain of the room is too large.
• If the heat source of the room is excessive (when cooling).
Cooling effect decreases if heat gain of the room is too large.
